=pro introduce akka-http-core module
+hco HttpRequest/Response definitions with required stubs for data types
+hco add rendering declarations
+hco ObjectRegistry: a registry for singleton values
+hco StatusCode implementation and predefined StatusCodes
+hco import HttpProtocols
+hco import HttpMethods
+hco import HttpCharsets
+hco imported Uri model

Rendering was extracted into its own object for better separation of concerns.
+hco import MediaType, ContentType, and HttpEntity